Fountain pen



FIG. 1 is a front elevational view of a fountain pen showing my new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a front elevational view thereof with the _cap removed;

FIG. 7 is a right side elevational view thereof with the cover _removed, the opposite side being a mirror image thereof;

FIG. 8 is a rear elevational view thereof, with the cover removed;

FIG. 9 is a top plan view thereof with the cover removed; and

FIG. 10 is a bottom plan view thereof with the cover removed. 

The ornamental design for a fountain pen, as shown and described. 